Questions[screencast](ubuntu)

I am using Ubuntu 18.04.01 LTS. I have spent a lot of time searching for Screen Recorders for the Ubuntu GNOME Wayland.

I have tried several Screen Recorders such as Simple Screen Recorder and Vokoscreen, but the result is only a blank screen with the cursor.

Any suggestions for me?

I would like to show the screen of my Ubuntu laptop on a Samsung TV.

The TV has a menu entry called "mirror screen".

But up to now I found no way to get it working.

I need a wireless way to us the TV as monitor.

Any hints?

Exact hardware version: Samsung SmartTV UE55J6250

If it is not possible via software am willing to buy some hardware.

I can do screencasts by pressing ctrl+alt+shift+r, but I get no sound when I view the videos, I've check my built in mic and headset, they both work on skype and such, I just can't record sound with the gnome built in screencasting. Also, when I open the videos in movieplayer they are in mute by default and there's nothing the the preferences I can find to change that.

Any help would be awesome!

I've seen animated GIF images of screen casts (like the one below) promoted a few times on this site as a way to improve answers.

What toolchain is being used to create these? Is there a program that does this automagically, or are people taking screencasts, converting them into a series of static frames, and then creating the GIF images?

How can I record my screen on Ubuntu?

The app I'm looking for has ideally all of these features:

1. Can record in a format that can be played back easily on any platform and/or accepted by YouTube or another popular video site
2. Can record just a window (instead of the whole screen), possibly selecting it with a mouse click
3. Can start recording after a configurable delay (e.g., I launch the app and have time to do arrangements to my desktop/window before actual recording starts)